Nielsen BookScan gathers point-of-sale book data from about 16,000 locations across the U.S., representing about 85 percent of the nation's book sales. Print-book data providers include all major booksellers and Web retailers, and food stores. E-book data providers include all major e-book retailers. Free e-books and those sold for less than 99 cents are excluded. The fiction and nonfiction lists in all formats include both adult and juvenile titles; the business list includes only adult titles. The combined lists track sales by title across all print and e-book formats; audio books are excluded. Refer questions to Michael.Boone(at)wsj.com.

One-day event to run slide down University HillIt's not quite the alternative mode of transportation that Boulder's used to, but, for one day this summer, residents will be able to traverse several city blocks atop inflatable tubes.